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IMPLEMENTATION OF OPTIMIZED BACKFILL MATERIALS FOR UNDERGROUND ELECTRIC POWER CABLES

Volume 17, Edição 9, 2014, pp. 831-840
DOI: 10.1615/JPorMedia.v17.i9.70
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RESUMO

The voltage and electric current should be increased to improve power transfer capability; however, their increases cause heat to be generated in the cables. The thermal resistivity of backfill material around buried power cables depends on its water content. Although an underground power cable generally produces 60° C heat, some power cables can cause thermal runaway in the dry condition. Thus, this triggers dielectric breakdown and creates factors that decrease power transmission efficiency. The objective of this study is to find the backfill material which maintains a low thermal resistivity in order to accommodate new cable systems that are designed for the most efficient operation at high temperature. The goal is 50° C-cm/W thermal resistivity in a wet condition, and 100° C-cm/W thermal resistivity in the dry condition.) However, river sand, widely used as a backfill material, has 150°C-cm/W thermal resistivity in the wet condition, and is more than double the wetted one in a dry condition. Experimental tests present a combination of crushed rock, recycled sand, stone powder, slag, and floc as an alternative backfill material for optimum heat transfer efficiency and construction waste recycling. The optimized backfill material is then validated by field tests and numerical analysis.

CITADO POR
  1. Salata Ferdinando, Nardecchia Fabio, Gugliermetti Franco, de Lieto Vollaro Andrea, How thermal conductivity of excavation materials affects the behavior of underground power cables, Applied Thermal Engineering, 100, 2016. Crossref

  2. Enescu Diana, Colella Pietro, Russo Angela, Porumb Radu Florin, Seritan George Calin, Concepts and Methods to Assess the Dynamic Thermal Rating of Underground Power Cables, Energies, 14, 9, 2021. Crossref

  3. Wu Yu-hao, Feng Yan-hao, Fan Li-wu, Wang Qing, Song Xin, Yu Zi-tao, Effects of moisture content and dry bulk density on the thermal conductivity of compacted backfill soil, Journal of Zhejiang University-SCIENCE A, 23, 8, 2022. Crossref

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